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authorHeiner Kallweit <heiner.kallweit@web.de>2014-03-12 22:13:19 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-04-26 17:13:17 -0700
commit4800c471ea65fba8d6fc105b51f8b1f43afbd91a (patch)
tree51ef805146bd1fc56d002c389ff55832627c9c6f /net
parentd82c152b565849a5290abc8e7e0c181257457c05 (diff)
downloadlwn-4800c471ea65fba8d6fc105b51f8b1f43afbd91a.tar.gz
lwn-4800c471ea65fba8d6fc105b51f8b1f43afbd91a.zip
ipv6: Avoid unnecessary temporary addresses being generated
[ Upstream commit ecab67015ef6e3f3635551dcc9971cf363cc1cd5 ] tmp_prefered_lft is an offset to ifp->tstamp, not now. Therefore age needs to be added to the condition. Age calculation in ipv6_create_tempaddr is different from the one in addrconf_verify and doesn't consider ADDRCONF_TIMER_FUZZ_MINUS. This can cause age in ipv6_create_tempaddr to be less than the one in addrconf_verify and therefore unnecessary temporary address to be generated. Use age calculation as in addrconf_modify to avoid this. Signed-off-by: Heiner Kallweit <heiner.kallweit@web.de> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index abfa0074d59f..f976c3858df0 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -897,8 +897,11 @@ retry:
* Lifetime is greater than REGEN_ADVANCE time units. In particular,
* an implementation must not create a temporary address with a zero
* Preferred Lifetime.
+ * Use age calculation as in addrconf_verify to avoid unnecessary
+ * temporary addresses being generated.
*/
- if (tmp_prefered_lft <= regen_advance) {
+ age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
+ if (tmp_prefered_lft <= regen_advance + age) {
in6_ifa_put(ifp);
in6_dev_put(idev);
ret = -1;